The first step is to find a supplier for the gas like zazbnf said. Where I am there is one shop (airgas, one locaton) who will fill either type of tank, but they only do it on fridays, and you drop it off at least the day before. There is no other salable use for this blend so demand is low.
So find the shop that can supply the gas blend and build you kit around that. There is no difference between the regulators, outside of what type of tank they fit. You will then need a Stout faucet with the proper nozzle and restrictor plate. Use around 30-45 psi depending on serving temp, your taste, etc.